Combination of texture and color cues in shape detection and identification G Meinhardt |
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University of Mainz, Germany
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| The contribution of cue summation effects for local saliency and form completion was studied in a combined feature target detection and figure shape identification task with orientation, spatial frequency, and color cues. Double-cue targets were combinations of the orientation cue with either spatial frequency or color. The double-cue gain in detection was much larger than predicted by the assumption of cue independence only for combinations of orientation and spatial scale, but not for combinations of orientation and color. In the figure identification task, however, performance was at the same levels for both types of cue combinations, and much larger than predicted by the assumption of cue-independence. The findings show that saliency of local texture elements and local border detection on the one hand and grouping of elements into global shapes concerns both feature pairings to different degrees. Orientation and color strongly are only weakly fused to enhance local border saliency, but strongly fused to enhance element grouping within a figure surface. Orientation and spatial scale are optimal segregation cues which render a figure visible mostly by enhancing its texture borders. |
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